What is the minimum size for a bonding jumper between a power system grounding electrode and a separate electrode?

The minimum size for a bonding jumper between a power system grounding electrode and a separate electrode is 6 AWG copper. This requirement ensures adequate conductivity and mechanical strength for grounding systems, providing effective fault current pathways. The National Electrical Code (NEC) establishes these standards to enhance safety by minimizing the risk of electric shock and ensuring that ground fault protection systems can operate correctly.

Using 6 AWG copper is particularly important in applications that involve larger installations or where significant fault currents may occur. The larger diameter allows for reduced resistance and improved performance when grounding, which is critical for safety during fault conditions. This choice supports the overall aim of ensuring that grounding electrodes can effectively mitigate electrical hazards.